The code you have written will work. But it will only ever retreive one security code - not one per 'person' (row) of the datatable. If you want to calculate a temporary value for each person (that isn't stored in the database) then I would suggest using a transient field on the Person entity. Then, when you populate personList, loop over personList and 'calculate' the value. This would normally be in a @Factory method - but I can't see yours. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977081#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...